Young scholars explore the concept of place value with a hand-made odometer. In this math lesson, students construct a cardboard odometer with movable paper strips to show increases in mileage to the hundredths place. Young scholars...

Ten of the important inventions and innovations of the ancient Greeks are described. These include the water mill, the odometer, alarm clocks, cartography, the Olympics, geometry, Hippocratic medicine, philosophy, democracy, and...